utility: added FilePath abstraction and rewrote data management to use it

The utility class FilePath wraps an instance of boost::filesystem::path. Using FilePath allows for easy comparision of
file paths on different platforms using absolute or relative paths. Whereever file paths are compared, this wrapper
should be used.

src/lib/utility/file/FilePath.h

@@ -0,0 +1,33 @@
+#ifndef FILE_PATH_H
+#define FILE_PATH_H
+
+#include <string>
+
+#include "boost/filesystem.hpp"
+
+class FilePath
+{
+public:
+	FilePath(const char* filePath);
+	FilePath(const std::string& filePath);
+	FilePath(const boost::filesystem::path& filePath);
+
+	bool exists() const;
+
+	std::string str() const;
+	std::string absoluteStr() const;
+	std::string fileName() const;
+
+	std::string extension() const;
+	FilePath withoutExtension() const;
+	bool hasExtension(const std::vector<std::string>& extensions) const;
+
+	bool operator==(const FilePath& other) const;
+	bool operator!=(const FilePath& other) const;
+	bool operator<(const FilePath& other) const;
+
+private:
+	boost::filesystem::path m_path;
+};
+
+#endif // FILE_PATH_H